intumescence
noun
in·tu·mes·cence ˌin-tü-ˈme-sᵊn(t)s 
-tyü-
: a swollen or enlarged part of a plant or animal
also : the process of swelling up or enlarging
Word History
Etymology
French, from Latin intumescere to swell up, from in- + tumescere to swell — more at tumescence
First Known Use
1650, in the meaning defined above
Medical Definition
intumescence
noun
in·tu·mes·cence -ˈmes-ᵊn(t)s
1
a
: the action or process of becoming enlarged or swollen
b
: the state of being swollen
2
: something (as a tumor) that is swollen or enlarged